book Maths Puzzle Numerical Ability

Hi,

I need help with finding the LCM
x^2+x-6;x^2+8+15;x^2-25

Thanks

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book Other Question

solve by using the quadratic formula. give your answers in simplest radical form. give both real and imaginary roots.

4/v = v-6 / v-4 if f = 3/4
-2f